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    //! Base Priority Mask Register (conditional write)

    /// Writes to BASEPRI *if*
    ///
    /// - `basepri != 0` AND `basepri::read() == 0`, OR
    /// - `basepri != 0` AND `basepri < basepri::read()`
    ///
    /// **IMPORTANT** If you are using a Cortex-M7 device with revision r0p1 you MUST enable the
    /// `cm7-r0p1` Cargo feature or this function WILL misbehave.
    #[inline]
    pub fn write(_basepri: u8) {
        match () {
            #[cfg(all(cortex_m, feature = "inline-asm"))]
            () => unsafe {
                match () {
                    #[cfg(not(feature = "cm7-r0p1"))]
                    () => asm!("msr BASEPRI_MAX, $0" :: "r"(_basepri) : "memory" : "volatile"),
                    #[cfg(feature = "cm7-r0p1")]
                    () => ::interrupt::free(
                        |_| asm!("msr BASEPRI_MAX, $0" :: "r"(_basepri) : "memory" : "volatile"),
                    ),
                }
            },

            #[cfg(all(cortex_m, not(feature = "inline-asm")))]
            () => unsafe {
                match () {
                    #[cfg(not(feature = "cm7-r0p1"))]
                    () => {
                        extern "C" {
                            fn __basepri_max(_: u8);
                        }

                        __basepri_max(_basepri)
                    }
                    #[cfg(feature = "cm7-r0p1")]
                    () => {
                        extern "C" {
                            fn __basepri_max_cm7_r0p1(_: u8);
                        }

                        __basepri_max_cm7_r0p1(_basepri)
                    }
                }
            },

            #[cfg(not(cortex_m))]
            () => unimplemented!(),
        }
    }

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